Which one of the following descriptions or statements about an electrocardiogram (ECG) is NOT correct?
- It is a record of the voltage changes (as measured at the body surface) due to the depolarisation of the muscle cells of the heart as it beats.
- The potentials measured by the ECG electrodes are combined in various ways to give 12 different ECGs.
- The ECG consists of the electrical events that follow the depolarisation of ventricles (PQR section), the depolarisation of atria (the S section) and the repolarisation of the ventricles (the T section).
- The value of the potential difference called “limb lead II” varies with time to produce the familiar ECG trace – a graph of voltage vs time.
Medicine
C: The ECG also displays the depolarisation of the atria (the P wave), the depolarisation of the ventricles results in the QRS wave – not the PQR wave.
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